Middlings-purifier



(No Model.)

C." G. ROLLINS.

MIDDLINGS PURIFIBR. No. 248,885. Patented Nov.1 18 l.

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PATiNT CHARLES G. ROLLINS, OF MINNEAPOLIS, MINNESOTA.

MiDDLlNGS-PURIFIER.

SPECIFICATION forming part of Letters Patent No. 248,885, dated November 1, 1881,

Application iled August 20, 1880. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES GREENLEAF ROLLINS, ofMinneapolis, in the county otHennepin and State of Minnesota, have made certain Improvements in Middlings-Purifiers, ot' which the following is a specitication.

My improvements consists in novel organization of parts and in certain combinations of devices, hereinafter fully described, and then specifically designated by the claims.

My invention is fully illustrated in tlie accompanying drawings, iu which Figure I is a longitudinal vertical section. Fig. II is an enlarged detail view of a portion of the screen and transverse slats detached, illustrating the manner in which the blast-currents are caught and distributed over the under surface of the bolting-cloth; Fig. III, a side view, detached, illustrating1 the manner ot' forming the connecting-rods and knockers. Fig. IV is a double plan view, that portion above the line x fr being a sectional plan view of the machine below the shaker-frame, while that portion below the line w a2 is a plan view, in section, above the screen. v

A is the frame or casing, in which the shakerframe B is suspended by adjustable woodensprings a in the ordinary manner.

O is the blast-fan below the screen, and I) the exhaust-fan above the screen, and E the feed-hopper. On either end of the feed-hopper two hangers, I) b, are pivoted at c (only one being shown) and connected to each other near the bottom by a cross-strip, d, which is formed slightly concave to correspond to the sweep ot' the hangers on the pivot c, while the bottom edges ofthe hopper E are made convex, to correspond to the concavity of the strip d. The lower edge ot' the rear side of the hopper E is made to t the strip d closely, while a space is left between the bottom of the front side and the strip for the escape of the chop, while an adjustable slide, E', will be arranged, as shown, over this opening, to regulate its width and control the dow of the middlings. By this arrangement, when the hangers b are oscillated the strip d will describe a small arc ot' a circle, and thus shake the m-iddlings in a thin even stream over its edge down to the screen.

The axial line of the hangers Z) will be at a slight angle backward, as shown, so that a forward and downward and an upward and backward motion is imparted to the strip l to cause the middliugs to iiow more freely and prevent any being carried backward by the return movement ofthe strip.

Rods e (only one being shown) connect the shaker-frame with the hangers b, so that the motion ot' the shaker-frame and feed-strip are simultaneous and correspond in speed and length of stroke, so that any variation in the shaker-frame will be communicated to the feed. The rods e, as will be seen, are pivotally connected to the lower ends ot' the hangers .b b, and slightly exible, if necessary.

Across the rear end of the shaker-frame a strip, g, is secured, and provided with studs g g2, extending out through the sides ot' the casing, and upon which connecting-rods F F are journaled and run back to eccentrics G Gr on the main driving and fan shaft C', by which means the shaker-frame is vibrated. The counecting-rods F F consist of two strips ot wood, connected at either end in any suitable manner to the studs g g2 and ecceutrics G, and spread apart at the center by a block or bolt, a', thus forming a truss-rod that can be made very light and strong.

H are two brackets or bars, secured to the frame A by set-screws working iu slots in the brackets so that they may be adjusted inward and outward, and having rods I I', pivoted to their inner ends and extending downward, and with their lower ends fitting loosely through holes in the cross-bar g. Secured rigidly to these rods I I and extending forward from them at right angles are small rods k ls', provided at their outer ends with heads or hammers m m. These hammers come just above the shaker-frame B, so that when the latter is vibrated the strip g will carry the lower endsy of the rods I I back and forth, and their up per ends being pivoted iu the brackets H, the hammers m m will be thrown up and down and strike the shaker-frame a slight blow at every stroke, and thus jar the dust, &c., loose from the bolting-cloth.

By adjusting the brackets H H outward or inward the hammers m m may be raised higher or lower from the shaker-frame, and thus iucrease or decrease the lengths ot' their strokes, to cause them to give a lighter or heavier blow.

IOO

Light blows in rapid succession on the shakerframe are much more effective than heavy blows at longer intervals, as the former do not disturb the flow of the middlings, while heavy blows have a tendency to shake up the middlings and disturb their even flow.

Any desired number of the knockers m m maybe employed, but ordinarily two, as shown, will be sufficient.

Under some circumstances it may be found advantageous to suspend the knocking, which may be done by moving the brackets H back until the hammers m m are raised so high that the backward stroke of the shaker-frame is not long enough to throw lthem down in contact with it.

Across the frame ofthe machine, beneath the shaker-frame B, another frame is suspended, having transverse slats n arranged therein, as shown, and made adjustable vertically to alter its inclination.

In the ordinary arrangement of middlingspurifiers, where nothing is interposed between the bolting-cloth and blast from the fau, eddies7 and whirls ofthe air are formed, which actin an uneven manner upon the middings; but by my arrangement ofthe slats a the blastcurrents will be caught and turned upward against the cloth in small portions, (see Fig. 2,) and thus evenly distribute the air over every part of the under surface of the boltingcloth and prevent any heavy blast coming in con tact therewith. By this means all danger from an uneven blast is avoided and every portion of the cloth treated alike, thus avoiding any disturbance of the ilow ofthe chop or the l'ormation of eddies or whirls.

K K are two adjustable wings arranged across the machine in the blast-current, and adapted to regulate and control the blast, to cause heavier or lighter blasts to be directed to different parts of the shaker-frame B and slats n, according to the requirements of the different grades or condition of the chop.

The lower part of the casing A is divided by chutes A A2 A3 A4 into two boppebbottomed compartments, having narrow outlets r rf, in which the dierent grades of middlings fall.

A5 isa wing or detlector pivoted at the conjunction ot the chutes A2 A, and adjustable from the outside of the machine, so that its upper point may be adjusted to correspond to the dividing-line between the clean and unclean middlings falling through the cloth. Ai is another wing or deilector arranged to act in conjunction with the first wing, A5, to extend its length, so that where little or no unclean middlings exists it may all be run into the first compartment, A A2. The wing A5 may be turned back, as shown by dotted lines Al, and thus enlarge the compartment A3 A* when the middlings are very unclean. By this means the clean and unclean middlings are separated.

I am aware that it is not new broadly to provide rappers,7 which Iare cause-d by the vibration of the shaker frame to rap the same during each movement.

What I claim as new is- 1. The combination and arrangement of the shaker-frame B, slats n, adjustable wingsKK, and fan C, substantially as set forth.

2. The combination, with the shaker-frame B and strip g, ofthe adjustable brackets H Hf, rods I I, and hammers m m', secured to extensions k k', all arranged to operate substantially as described.

3. The combination, with the leed-hopper E, having a convex lower edge, ofthe hangers b b, and concave feed-strip d, connected pivotally by the rod e to the shaker-frame, whereby the strip is oscillated and the feed produced, as described, by the motion of the shakerframe.

In testimony whereofI have hereunto set my hand in the presence ot' two subscribing witnesses.

CHARLES GREENLEAF ROLLINS.

Vitnesses:

C. N. WooDwARD, LoUs FEEsER. 

